NEW YORK, Feb 10 (Reuters) - One of every five U.S. home owners owed more on their mortgage than their home was worth in the fourth quarter, a trend that poses a serious threat to the U.S. housing market’s recovery, real estate website Zillow.com said on Wednesday.

Homeowners with “underwater” mortgages are more prone to defaults and foreclosures. They typically do not qualify for refinancings and are unable to sell their homes because they would need to cough up cash at closing time to pay off their mortgage.

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